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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is |
| A. | 0.1 V/mm |
| B. | 0.5 V/mm |
| C. | 1 V/mm |
| D. | 5 V/mm |
| Answer» D. 5 V/mm | |
| 302. |
Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.Reason (R): A wattmeter measures apparent power. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» D. A is false R is true | |
| 303. |
Figure shows an RC potentiometer to measure ac voltage. It is desired that V0/Vi should be independent of frequency. The value of C should be |
| A. | 10 F |
| B. | 11 F |
| C. | 0.1 F |
| D. | 0.09 F |
| Answer» B. 11 F | |
| 304. |
In the amplifier circuit of figure hfe = 100 and hie = 1000 Ω. The voltage gain of amplifier is about |
| A. | 0.33 |
| B. | 0.5 |
| C. | 0.66 |
| D. | 1 |
| Answer» E. | |
| 305. |
Negative feedback reduces noise originating at the amplifier input. |
| A. | True |
| B. | False |
| Answer» C. | |
| 306. |
The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier. |
| A. | True |
| B. | False |
| Answer» C. | |
| 307. |
Assertion (A): For large signal variations an amplifier circuit has to be analysed graphicallyReason (R): The output characteristics of a transistor is nonlinear. |
| A. | Both A and R are correct and R is correct explanation for A |
| B. | Both A and R are correct but R is not correct explanation for A |
| C. | A is correct R is wrong |
| D. | A is wrong R is correct |
| Answer» B. Both A and R are correct but R is not correct explanation for A | |
| 308. |
For a system to work, as oscillator the total phase shift of the loop gain must be equal to |
| A. | 90 |
| B. | 45 |
| C. | 270 |
| D. | 360 |
| Answer» E. | |
| 309. |
Assertion (A): CE amplifier is the most widely used BJT amplifierReason (R): CE amplifier has zero phase difference between input and output |
| A. | Both A and R are correct and R is correct explanation for A |
| B. | Both A and R are correct but R is not correct explanation for A |
| C. | A is correct R is wrong |
| D. | A is wrong R is correct |
| Answer» D. A is wrong R is correct | |
| 310. |
In a CE amplifier the input impedance is equal to the ratio of |
| A. | ac base voltage to ac base current |
| B. | ac base voltage to ac emitter current |
| C. | ac emitter voltage to ac collector current |
| D. | ac collector voltage to ac collector current |
| Answer» B. ac base voltage to ac emitter current | |
| 311. |
The output V0 in figure is |
| A. | -100 V |
| B. | -100 mV |
| C. | 10 V |
| D. | 10 mV |
| Answer» C. 10 V | |
| 312. |
The transistor of following figure in Si diode with a base current of 40 A and ICBO = 0, if VBB = 6V, RE = 2 kΩ and = 90, IBQ = 20 A then RB = |
| A. | 200 kΩ |
| B. | 265 kΩ |
| C. | 150 kΩ |
| D. | 100 kΩ |
| Answer» C. 150 kΩ | |
| 313. |
Maximum efficiency of class B power amplifier is 50%. |
| A. | True |
| B. | False |
| Answer» C. | |
| 314. |
In figure what is the base current if VBE = 0.7 V |
| A. | 10 mA |
| B. | 9.3 mA |
| C. | 10 A |
| D. | 9.3 A |
| Answer» E. | |
| 315. |
In figure ID = 4 mA. Then VS = |
| A. | 20 V |
| B. | 4.4 V |
| C. | 0.4 V |
| D. | 0.44 V |
| Answer» C. 0.4 V | |
| 316. |
The self bias provides |
| A. | stable Q point |
| B. | large voltage gain |
| C. | high input impedance |
| D. | high base current |
| Answer» B. large voltage gain | |
| 317. |
In figure what is value of IC if dc = 100. Neglect VBE |
| A. | 5 mA |
| B. | 5 A |
| C. | 10 mA |
| D. | 10 A |
| Answer» D. 10 A | |
| 318. |
An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a |
| A. | sine wave |
| B. | square wave |
| C. | triangular wave |
| D. | (a) or (c) |
| Answer» C. triangular wave | |
| 319. |
Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance? |
| A. | Voltmeter having a resistance of 5 kΩ |
| B. | Voltmeter having a sensitivity of 1 kW/V |
| C. | Voltmeter having sensitivity of 10 kW/V |
| D. | None of the above |
| Answer» D. None of the above | |
| 320. |
In which of the transformer is the secondary nearly short circuited under normal operating conditions? |
| A. | CT |
| B. | PT |
| C. | Distribution transformer |
| D. | Power transformer |
| Answer» B. PT | |
| 321. |
In figure The minimum and maximum load currents are |
| A. | 0 and 60 mA |
| B. | 0 and 120 mA |
| C. | 10 mA and 60 mA |
| D. | 10 mA and 120 mA |
| Answer» C. 10 mA and 60 mA | |
| 322. |
In figure, VEB = 0.6 V, = 99. Then VC and IC are |
| A. | 9.3 V and 1.98 mA respectively |
| B. | 4.6 V and 1.98 mA respectively |
| C. | 9.3 V and 0.02 mA respectively |
| D. | 4.6 V and 0.02 mA respectively |
| Answer» B. 4.6 V and 1.98 mA respectively | |
| 323. |
Assertion (A): De sauty's bridge is suitable only for pure capacitor.Reason (R): Capacitors are mostly perfect. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» D. A is false R is true | |
| 324. |
The system in the given figure, has |
| A. | good gain and phase margin |
| B. | poor gain and phase margin |
| C. | good gain margin but poor phase margin |
| D. | poor gain margin but good phase margin |
| Answer» E. | |
| 325. |
The given figure shows a pole zero diagram. The transfer function G(j1) is |
| A. | 0.5 0 |
| B. | 2.7 - 31 |
| C. | 2 45 |
| D. | 2 - 67.4 |
| Answer» B. 2.7 - 31 | |
| 326. |
For very low frequencies, v0/vi in the given figure equals |
| A. | 1 |
| B. | 0 |
| C. | |
| D. | 0.5 |
| Answer» B. 0 | |
| 327. |
In a minimum phase system |
| A. | all poles lie in the left half plane |
| B. | all zeros lie in the left half plane |
| C. | all poles lie in the right half plane |
| D. | all except one pole or zero lie in the left half plane |
| Answer» C. all poles lie in the right half plane | |
| 328. |
In the given figure, if R = XC, voltage gain is |
| A. | 0 dB |
| B. | 3 dB |
| C. | -3 dB |
| D. | 20 dB |
| Answer» D. 20 dB | |
| 329. |
For the control system in the given figure, the value of K for critical damping is |
| A. | 1 |
| B. | 5.125 |
| C. | 6.831 |
| D. | 10 |
| Answer» C. 6.831 | |
| 330. |
For the system in the given figure, |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-225-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-225-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-225-3.png"> |
| D. | none of the above |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-225-3.png"> | |
| 331. |
For the system of the given figure the transfer function is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-245-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-245-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-245-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-245-4.png"> |
| Answer» E. | |
| 332. |
For the circuit in the given figure, V2(s)/V1(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-258-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-258-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-258-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-258-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-258-3.png"> | |
| 333. |
For the given figure C(s)/R(s) |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-59-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-59-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-59-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-59-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-59-3.png"> | |
| 334. |
In the given figure shows pole-zero plot. If steady state gain is 2 the transfer function G(s) is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/22-187-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/22-187-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/22-187-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/22-187-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/22-187-2.png"> | |
| 335. |
A stepper motor is |
| A. | a two phase induction motor |
| B. | is a kind of rotating amplifier |
| C. | is an electromagnetic transducer used to convert an angular position of shaft into electrical signal |
| D. | is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis |
| Answer» E. | |
| 336. |
A unity feedback system has open loop transfer function The closed loop transfer function is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-57-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-57-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-57-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-57-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-57-3.png"> | |
| 337. |
Consider the systems with following open loop transfer functions If unity feedback is used, the increasing order of time taken for unit step response to settle is |
| A. | 1, 2, 3 |
| B. | 3, 1, 2 |
| C. | 2, 3, 1 |
| D. | 3, 2, 1 |
| Answer» D. 3, 2, 1 | |
| 338. |
The phase margin and damping ratio have no relation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 339. |
For the transport lag G(j ) = e-j T, the magnitude is always equal to |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | 0.5 |
| Answer» C. 10 | |
| 340. |
The log magnitude curve for a constant gain K is a |
| A. | horizontal straight line |
| B. | horizontal straight line of magnitude 20 log K decibels |
| C. | an inclined line having slope K |
| D. | an inclined line having slope -K |
| Answer» C. an inclined line having slope K | |
| 341. |
The compensator of the given figure is a |
| A. | lag compensator |
| B. | lead compensator |
| C. | lag-lead compensator |
| D. | none of the above |
| Answer» C. lag-lead compensator | |
| 342. |
If a system is to follow arbitrary inputs accurately the bandwidth should be |
| A. | large |
| B. | small |
| C. | very small |
| D. | neither small nor large |
| Answer» B. small | |
| 343. |
For the system of the given figure, the damping ratio of closed loop poles is |
| A. | 1.5 |
| B. | 1 |
| C. | 0.5 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 344. |
Assertion (A): Potentiometers can not be used as error detectors in position control systems.Reason (R): The resolution of a potentiometer places an upper limit on its accuracy |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» E. | |
| 345. |
From the noise point of view, bandwidth should |
| A. | be large |
| B. | not be too large |
| C. | should be as large as possible |
| D. | should be infinite |
| Answer» C. should be as large as possible | |
| 346. |
Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions. Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by j |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» E. | |
| 347. |
When a unit step voltage drives a lag network the output |
| A. | remains constant at unit step value |
| B. | increases exponentially from zero to final value |
| C. | decreases exponentially from 1 to 0 |
| D. | either (b) of (c) depending on values of R and C |
| Answer» C. decreases exponentially from 1 to 0 | |
| 348. |
For the given figure C(s)/R(s) |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-47-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-47-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-47-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-47-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-47-2.png"> | |
| 349. |
Bellows converts |
| A. | pressure difference into displacement |
| B. | pressure difference into voltage |
| C. | displacement into pressure difference |
| D. | either (a) or (c) |
| Answer» B. pressure difference into voltage | |
| 350. |
A system has its two poles on the negative real axis and one pair of poles lies on j axis. The system is |
| A. | stable |
| B. | unstable |
| C. | limitedly stable |
| D. | either (a) or (c) |
| Answer» D. either (a) or (c) | |